Cloning a bunch of stuff from the native_client repository at r6528

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_core.h

Index: ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_core.h
===================================================================
--- ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_core.h	(revision 0)
+++ ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_core.h	(revision 0)
@@ -0,0 +1,30 @@
+// Copyright 2010 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can
+// be found in the LICENSE file.
+
+#ifndef NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_CORE_H_
+#define NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_CORE_H_
+
+#include "native_client/src/include/nacl_macros.h"
+
+class PPB_Core;
+
+namespace ppapi_proxy {
+
+// Implements the untrusted side of the PPB_Core interface.
+// We will also need an rpc service to implement the trusted side, which is a
+// very thin wrapper around the PPB_Core interface returned from the browser.
+class PluginCore {
+ public:
+  // Return an interface pointer usable by PPAPI plugins.
+  static const PPB_Core* GetInterface();
+  // Mark the calling thread as the main thread for IsMainThread.
+  static void MarkMainThread();
+
+ private:
+  NACL_DISALLOW_COPY_AND_ASSIGN(PluginCore);
+};
+
+}  // namespace ppapi_proxy
+
+#endif  // NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_CORE_H_